Pencil.



0. W. BOMAN.

PENCIL.

APPLICATION FILED 0OT.14, 1910.

Patented 1131.14, 1911.

- CLAES WILIAM BOMAN, OF NEW .nection with up STATES PATENT OFFI YORK, N. Y., ASSIGNOR TO EAGLE PENCIL COMPANY,

OF NEW YORK, N. Y.

PENCIL.

ceases.

Specification of Letters Patent.

Patented Mar. 14L, 1911.

Application filed October 14, 1910. Serial No. 587,093.

To all whom it may concern:

Be it known that I, CLAES MAN, residing in the city, county, and State of NewYork, have invented a new and useful Improvement in Pencils, of which the following is a specification.

My invention is directed to a mechanical pencil of the proand re-pelling type-that is to say a pencil in which the well known proand re-pelling' movement, so called, is employed for the purpose of advancing and retracting the lead. My invention is directed to certain improvements in the form and adaptation of parts in a pencil of this kind, designed more particularly to etfectively hold and control the movement of leads of very small diameter. These improvements will first be described in conthe accompanying' drawing, forming part of this specification, and will then be more particularly pointed out in the claim.

In said drawings Figure 1 is an axial section of a pencil embodying my invention in its preferred form, the parts being in the position which they occupy when the lead is retracted. Fig. 2 is a like section with the parts in the position they assume when the lead is projected from the nozzle of the pencil. Fig. 3 is a perspective view of the proand re-pelling WILIAM Bomovement with its parts detached from one another. Fig. 4 is a like view of the nozzle and interior body portion of tie pencil attached to the same.

A is the nozzle or tapering front end of the pencil from which extends rearwardly the cylindrical body portion a, and beyond that a cylindrical longitudinal fluted barrel Z) of relatively smaller diameter, in which the movement is housed, and, as to its lead carrying portion, can move longitudinally back and forth. Upon the cylindrical body portion a, and flush with the same, is mounted a sleeve 0, which is capable of free rotary movement, without lengthwise movement thereon, it having for this purpose, in the present instance, an annular internal bead 1, which engages a correspondingly annular external groove 2 in the body a.

The movement comprises essentially a longitudinally movable lead carrier, and a rotating propelling screw. The lead carrier consists of a sheet metal cylindrical tube d on the front end of which is a stem e of smaller diameter, having in its front end a cylindrical socket to receive and hold the lead. Upon the rear end of the tube is made fast a section fof a sheet metal longitudinally fluted tube, which, when the carrier is inserted in the fluted barrel 6 of the body portion, will fit snugly therein, with its flutes engaging those of the barrel, whereby the lead carrier is permitted longitudinal movement only in the barrel b in which it is housed. Other known means of preventing rotary movement of the lead carrier in the barrel, may what is essential being that the carrier shall be capable of longitudinal movement only in the barrel. The propelling screw 1 is a solid externally threaded rod, which is received and fits snugly in the carrier tube cl, in which it can rotate. The screw thread in the propeller screw is engaged by a suitable pin projecting inwardly from the carrier to engage the thread in the screw. This pin consists in the present instance of a projection I" at the rear end of the fluted sheetmetal section f.

Upon the rear end of the propeller screw 9, is a head 9 which, when the movement is in place in the barrel b, brings up against the rear end of said barrel. It is held in this position by the tubular sheath or handle H, which receives the body portion of the pencil. The sheath is secured fast to the head of the propeller movement, and also to the rotating sleeve 0 on the body portion a, with its front end abutting against an annular shoulder s on the nozzle A. The sheath and body portion are thus held firmly together, while at the same time they are free to rotate relatively to one another.

dictation of the sheath will produce corresponding rotary movement of the propelling screw, and this movement of the screw will advance or retract the lead carrier, according to the direction of rotation of the screw, as will be understood without further explanation.

Having described my invention, what I claim herein as new and desire to secure by Letters Patent, is as follows:

The combination with the main body portion and the barrelconnccted therewith, of the tubular lead-carrier housed in the barrel and capable of longitudinal movement only therein, the rotatable propelling screw rod be substituted for the flutes,

fitting and housedin said carrier and proits front to therotatab1e sleeve, as and for jecting beyond the rearend of the barrel, a the purposes hereinbefore set forth. 10 head on said projecting part of the propel- In testimony whereof I aflix my signature ling screw rod to the rear of the barrel, a in presence of two Witnesses.

5 sleeve secured to and rotatable upon the CLAES WILIAM BOMAN. main front body portion of the pencil, and Witnesses: v a tubular sheath secured at its rear to the I 011 0 GUGENHEIM,

head on. the propellingscrew rod, and at Osc-AR B. ANDERSON. 

